What Is Resistance In Electric Current

This continuous movement of electric charge through the conductors of a circuit is called a current and it is often referred to in terms of flow just like the flow of a liquid through a hollow.

What is resistance in electric current. A resistance is generated by anything impeding current for example a light bulb or heating element. A potential difference voltage across an electrical component is needed to make a current flow through it. These are the three basic building blocks required to manipulate and utilize electricity. Resistance is a measure of the opposition to current flow in an electrical circuit.

At first these concepts can be difficult to understand because we cannot see them. When beginning to explore the world of electricity and electronics it is vital to start by understanding the basics of voltage current and resistance. 15 electric current is measured using a device called an ammeter. Voltage is measured in volts with one volt being defined as the electrical pressure required to force an electrical current of one ampere through a resistance of one ohm.

The power p in watts w is equal to the voltage v in volts v times the current i in amps a. Electrical power and energy. The relationship between resistance and resistivity is. The si unit of electric current is the ampere or amp which is the flow of electric charge across a surface at the rate of one coulomb per second.

Electric currents cause joule heating which creates light in incandescent light bulbs. Voltage current and resistance. Resistance is measured in ohms symbolized by the greek letter omega ω. A is an si base unit.

Ohms are named after georg simon ohm 1784 1854 a german physicist who studied the relationship between voltage current and resistance. In electronics and electromagnetism the electrical resistance of an object is a measure of its opposition to the flow of electric current the reciprocal quantity is electrical conductance and is the ease with which an electric current passes electrical resistance shares some conceptual parallels with the notion of mechanical friction the si unit of electrical resistance is the ohm ω. In fact there is a relationship between voltage resistance and current. The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω.

The relationship between resistance voltage and current is known as ohm s law and it is one of the fundamental relationships in electrical and electronic science. Current is the rate of flow of electric charge. V v i a r ω. Knowing two of the variables it is possible to calculate the third.